ABSTRACT
The interplay between species interactions and dispersal is the key determinant of diversity in spatially structured environments (Leibold et al. 2004, 2005). A great deal is known about this interplay in communities with one or two trophic levels (e.g., resource, consumer; Levin 1974; Holt 1985; Murdoch et al. 1992; Amarasekare and Nisbet 2001; Jansen 2001; Abrams and Wilson 2004) but relatively little is known about it in communitieswith multiple trophic levels (e.g., resource, consumer, natural enemy).
